LUCKNOW: The population of Lucknow has almost doubled in the past two decades and so has its demand for water. Today population of the city is nearly 30 lakh. A population of one lakh, including migrants, is being added every year. Although the Jal Sansthan says that water demand is about 480 million litre daily (mld), unofficially the demand today is said to be over 800 mld.